ZendFramework, using same variable twice causing null value

Hi I have a application where I have a list of clubs once the club is clicked it goes to a description page of this club by passing the variable "club_id" and then getting the information for that specific club. On this page is a comments box, at the moment If I click the comment button I get the data I need in the comments box but then when trying to redirect to the index page I get the error below:

Error -> http://pastebin.com/VscHSGXF

clubDescriptionController:

public function indexAction()
 {
    $this->authoriseUser();
    //get id param from index.phtml (view)
    $id = $this->getRequest()->getParam('club_id');
    //get model and query by $id
    $clubs = new Application_Model_DbTable_Clubs();
    $clubs = $clubs->getClub($id);
    //assign data from model to view [EDIT](display.phtml)
    $this->view->clubs = $clubs;
 
    $form = new Application_Form_Comment();
         $form->submit->setLabel('Comment');
         $this->view->form = $form;
         if ($this->getRequest()->isPost()) {
             $formData = $this->getRequest()->getPost();
             if ($form->isValid($formData)) {
             $comment = new Application_Model_DbTable_Comments();
             $comment->addComment($formData['comment'], $id);
                 $this->_helper->redirector('index');
             } else {
                 $form->populate($formData);
             }
         }
     }
 

Comment form:

<?php
 
 class Application_Form_Comment extends Zend_Form
 {
 
     public function init()
     {
         $this->setName('comment');
         $id = new Zend_Form_Element_Hidden('id');
   $id->addFilter('Int');
         $comment = new Zend_Form_Element_Text('comment');
         $comment->setRequired(true)
                 ->addFilter('StripTags')
                 ->addFilter('StringTrim')
                 ->addValidator('NotEmpty');
         $submit = new Zend_Form_Element_Submit('submit');
         $submit->setAttrib('id', 'submitbutton');
         $this->addElements(array($id, $comment, $submit));
     }
 }
 

Comments model:

<?php
 
 class Application_Model_DbTable_Comments extends Zend_Db_Table_Abstract
 {
 
 protected $_name = 'comments';
 
 public function getComment($id) {
     $id = (int) $id;
     $row = $this->fetchRow('id = ' . $id);
     if (!$row) {
         throw new Exception("Count not find row $id");
     }
     return $row->toArray();
 }
 
 public function addComment($comment, $club_id) {
     $data = array(
         'comment' => $comment,
         'club_id' => $club_id,
         'comment_date' => new Zend_Db_Expr('NOW()'),
         );
     $this->insert($data);
     }   
 
         public function deleteComment($id) {
         $this->delete('id =' . (int) $id);
         }
 }
 

ClubDescription Index.phtml:

<div id="comments-holder">
         <p id="comments-title">Comments</p>
             <?php echo $this->form; ?>
 </div>
 

Thanks

Rik

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